Late 1951 saw "A Parker Trading Game" dropped in favor of "Parker Brothers’ Trade-Mark Name for its Real Estate Trading Game" (it's not known if any of these games were released in 1951 or it was early 1952). The 2nd patent expired 31st December 1952 so sets beginning with 1953 had no patent numbers on them. "San Francisco" was added to the list of cities in 1954 and "Atlanta" was added in 1956.
The blue and black box #6s ended their run in 1952 to be replaced by a red box popular edition (this set used the same graphics as the #8). I have not seen a 1953 #8. If you have one or have pictures of one please contact me.
Both of these sets were replaced in 1954 by slightly larger boxes with different graphics. These sets would be the last of the small box, separate board sets. Three different boxes exist for the red boxes and two for the green. It's my best guess that the first is from 1954, the second from 1955, and the third from 1956. If anyone has a 1956 green box or pictures of one please contact me.
Plastic houses and hotels found their way into the last of the #6, #8, and #9 sets. My best guess is that any of these sets with plastic are from 1955/6.
San Francisco added to list of cities in 1954.
Atlanta added to list of cities in 1956 sets.
1935 copyright removed from money about 1953.
Rent on Marvin Gardens changed to $24 in 1951.
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